Retailer of science and education toys
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Really magi with very young people.
Very quick response
Very happy with the range of kits
Have you ever seen or heard of termocolor paper?
It looks prety similar to the termocolor film i`v ordered but with slight differences:
-its thinner, very clise to regular audio tape thinnes
-it not contains the actual "crystal" layer inside
I`v saw it and use it with my own in early 90s-00s in Russia,
it was very common and i would say cheap material used in
"bio arura detectors" - postcards with small square piece of this termocolor paper. Place your finger on it and it will color itself from black to red, going through rainbow colors.
Now it disappeared totally and i was only able to find the termocolor film from your site.
Please, let me know if you aware of what am i searching for.